UK terrorism arrests rise as war crimes investigations surge by 50% since 2020
Demand for war crimes investigations has surged by 50% since 2020, reflecting a growing focus on state-related threats. Meanwhile, terrorism arrests in the UK also saw a slight rise in 2025, with authorities handling more cases than in previous years.
In 2025, UK counter-terrorism units made 255 arrests, up 2% from the 250 recorded in 2024. The vast majority—92%—were men and boys, while 8% were women and girls. Among those detained, 39 were aged 17 or younger.
State threat investigations now make up over 20% of all casework, a significant shift in priorities. The public also played a role, submitting around 25,000 reports through the Anti-Terror hotline and online portal during the year.
By the end of 2025, 267 people were in custody in Great Britain for terrorism-related offences—the highest number since comparable records began. However, no data is available on how many of these detentions stemmed from war crimes investigations.
The rise in arrests and reports highlights an increased focus on both terrorism and state-related threats. With custody numbers at a record high, authorities continue to monitor and respond to evolving security challenges across the UK.
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